[R]:RDCOMClient and outlook : how to send to multiple recipients or cc someone?

Set the To/CC/BCC properties to a ";" separated list of emails or call MailItem.Recipients.Add for each recipient.

use this highlighted code to share the emails to multiple lists

outMail[["To"]] = paste("[email protected]","[email protected]", sep=";", collapse=NULL)

same logic with Cc for multiple list except below thing

outMail[["Cc"]]= "[email protected]"